| 摘要 |
PURPOSE:To prevent the stripping of metallic foil and the interlayer stripping of a base board by forming projecting parts around holes through which blanking punches move in and out. CONSTITUTION:Projecting parts 15 are formed on the pressing surface side of a stripper plate 3 at the positions facing the land parts of a printed circuit board 1. The parts 15 are formed by using an original plate for solder resist printing of the printed circuit board, printing said parts on the surface of the stripper plate, masking the printed surface and etching the same. The bottom surface of the parts 15 adheres tightly to metallic foil 13 in the stage of blanking and while the peripheries of the parts to be blanked are thoroughly pressed, punching and removing of punches are accomplished and therefore the blanking is performed without the stripping of the foil and the interlayer stripping of the board. |
